Hallo,I am very new to Arduino and to electronics in general, so before I start with the wrong path, I thought I ask here first

I have connect my Arduino Mega to my oscilloscope and upload a simple Blink LOOP with the delayMicroseconds() command. It seems that maximal speed Arduino can do is 62us at an inaccuracy of +/- 300ns (on 1 digital port, port 12 in this case)

For my project I will need stable//accurate signals in a range of 60ns - 40ms on 11ports (10 for a LED array and 1 to control another device)... is that even possible with arduinos programming environment or do I need assembler for that?

@robtillaartThanks for the answer!I can't find the post anymore, but I am sure I have read somewhere that he has a cycle of 2ns.. but I may be wrong on that since I don't understand much of the actual internal work of a MC.Anyway... I would be happy with a stable 40ms signal.

Example: 2ms ON, 38ms OFF, LOOP... even at that speed, he is jigling too much for my taste.Is the delay() command the usualy way to go for that, or is there any better command for that?

The more I google, the more I get the impression that I need assembler for accurate timings for thos signals.

If you're looking for 2ms pulse width you may find delayMicroseconds more to your liking (http://arduino.cc/en/Reference/DelayMicroseconds) oryou may want to avoid using delay and just loop checking micros() to see if the pin needs pulsing. The other thing to be aware of is that digitalWrite() takes quite a while, if you want a faster response you may need to manipulate the port directly.

Using DDRx, to set direction and PORTx to write to the pin you want.If the 40ms is fixed using a timer is the best way to have 0 jitter, you see jitter because the millis values are returned from an interrrupt routine and the port access's are not atomic, and they can be interrupted in the middle of a write.To learn about direct port manipulation see this:http://hekilledmywire.wordpress.com/2011/02/23/direct-port-manipulation-using-the-digital-ports-tutorial-part-3/

The jitter on an arduino output signal is caused by the interrupts running in the rest of the system doing things like the real time clock and the handling of the serial ports.To remove this you must disable the interrupts, then delay() will not work and you have to write your own delay loops.

The LEDs and a Camera are controlled by the sync signal of the Arduino. I use the array to measure how long the Camera needs from the trigger signal to the first picture recorded on different frame-rates. I will post the code once its done... its a very slow progressing project since every time I need something, i need to google and play around till it works ..but its a good way to learn this stuff.